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Protecting the inputs of the ADA4895-1

Question asked by Scott105 on Oct 22, 2016
Latest reply on Oct 22, 2016 by Scott105

The ADA4895-1 datasheet lists the maximum differential input voltage to +/-0.7V and that the differential current should be limited to 10mA. In the non-inverting mode for a gain of 10x the recommended resistors are Rfb = 226, Rg = 25.5. If the input can be as high as 5V the total resistance from the input though the to Rg to ground would need to be 500 ohms. With Rg = 25.5 ohms the input resistor would need to be 475 ohms.

 

Is there a different/better way to insure the input current is limited to 10mA?

 

Note: The 5V input is the input clamp voltage not the normal operating input voltage.

 

Scott

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